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In '''electric''' instruments, the body serves simply as an anchor. Thus, we see lots of types (and weights) of wood used, as well as body shapes and sizes in electrics. Pickups are used to convert the string resonance into electrical current, which is then sent to an amplifier which drives a speaker. (There are also '''acoustic-electric''' instruments that are essentially acoustic instruments with added pickups.)
''Strings can be excited in a variety of manners.'' For guitar, the strings are typically excited with a '''plectrum (pick)''' or with the fingers. Most classical stringed instruments (violin, viola, bass) are excited with a '''bow''', which rubs horsehair against the strings, although they are sometimes plucked (pizzicato) with fingers. Piano uses '''hammers''' to strike its strings, similar to the technique of slapping, which is common in modern bass. The strings can also be excited by sound waves; examples include yelling at them or '''feedback''' from an amplified speaker connected to the instrument. Finally, magnetic strings (as used by electric guitars) can have resonance induced through electromagnetic force, such as through an E-Bow EBow or Sustainiac device.
[[Category:Guitar]]